花岗质岩浆岩土壤重金属地球化学特征及生态风险评价——以云南盈江旧城—姐冒地区为例

doi:10.11720/wtyht.2021.1522

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Abstract

Based on 238 rock samples and 4,931 soil samples collected from the Jiucheng-Jiemao area of Yingjiang County, Yunnan Province, and compared with other geological units, this paper is focused on the study of geochemical characteristics and sources of heavy metals in granitic magmatic rocks and soils as well as ecological risk assessment of soil heavy metals. According to the results obtained, the granitic magmatic rocks and Gaoligongshan group(Pt₁GL.)rocks have similar provenances or inheritances. The Pb content in the two kinds of rocks is higher than that in the upper crust, while the content of other heavy metals is lower. The soil heavy metal content and change characteristics of the Quaternary (Q^a), Mangbang formation (N₂m) and Gaoligongshan group (Pt₁GL.) are basically the same as those of the granitic magmatic rock, which are significantly lower than the Quaternary (Q^b) and Guanshang formation (D₁g). Combined with lithologic compositions, the soil parent materials of the Quaternary (Q^a), Mangbang formation (N₂m) and Gaoligongshan group (Pt₁GL.)may be mainly granitic magmatic rocks. The soil heavy metal values of the granitic magmatic rock and Guanshang formation (D₁g) are mainly affected by natural sources, and the influence of human activities is little. The geoaccumulation index and the potential ecological risk index indicate that the granitic magmatic soil has a low ecological risk of heavy metals and is a clean soil.The soil-forming parent materials of farmland with the production function of grain, sugar, vegetable, etc. in Dehong Prefecture are mainly granitic magmatic rock, but related study work is insufficient. Through comparative research, it is believed that Dehong Prefecture has great potential in developing green and pollution-free food production.

Key words： soil heavy metals granitic magmatic rock source analysis ecological risk assessment Yingjiang County

Received: 14 November 2020 Published: 15 December 2021

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	Gao-Qiang XIAO
	Long-Zhou XIANG
	Da-Long DAI
	Xiao-Hong GAO
	Qing-Xia ZONG

Cite this article:

Gao-Qiang XIAO,Long-Zhou XIANG,Da-Long DAI, et al. Geochemical characteristics and ecological risk assessment of heavy metals in granitic magmatic soil: A case study of the Jiucheng-Jiemao area in Yingjiang County, Yunnan Province[J]. Geophysical and Geochemical Exploration, 2021, 45(5): 1135-1146.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1522 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I5/1135

Geological map of Yingjiang County(a) and its regional geology(b) and regional location (c)

Statistical results of heavy metal content in rocks of different geological units

Variation characteristics of heavy metal content in rocks and soils in different geological units

地质单元	统计参数	As	Cd	Cr	Cu	Hg	Ni	Pb	Zn
Q^a(n=3018)	含量范围/10^-6	0.03~35.4	0.01~1.79	4.24~127	2.08~65.5	0.006~0.453	0.85~78.7	15.9~305	20~331
	算术平均值/10^-6	2.64	0.094	38.4	12.4	0.032	13.7	41.7	68.8
	变异系数/%	86.5	82.7	40.7	43.0	71.2	52.3	27.5	27.7
	中位值/10^-6	2.15	0.080	38.2	11.7	0.028	13.1	41.6	67.1
Q^b(n=674)	含量范围/10^-6	0.18~136	0.01~4.06	10.3~175	4.45~68.6	0.007~0.628	3.69~137	8.52~372	19.5~533
	算术平均值/10^-6	15.5	0.142	88.8	27.4	0.048	41.1	48.8	91.2
	变异系数/%	83.0	149.9	40.8	39.5	77.3	48.8	51.9	45.5
	中位值/10^-6	13.5	0.090	91.6	29.2	0.044	43.3	42.5	84.1
N₂m(n=258)	含量范围/10^-6	0.05~51.4	0.01~1.58	7.42~108	2.68~52.4	0.006~0.145	2.25~53	22.2~221	26.4~341
	算术平均值/10^-6	4.30	0.049	48.1	13.2	0.039	18.9	37.0	59.1
	变异系数/%	104.4	206.3	49.9	58.7	48.2	61.7	36.7	39.4
	中位值/10^-6	3.05	0.040	44.9	10.95	0.036	16.0	35.7	57.5
D₁g(n=396)	含量范围/10^-6	2.61~296	0.01~3.46	37.3~152	8.23~91.6	0.017~0.13	16.9~137	13.5~899	17.1~887
	算术平均值/10^-6	25.7	0.195	103	35.2	0.060	51.9	60.2	122
	变异系数/%	126.7	174.6	17.6	27.2	30.3	29.9	148.5	61.2
	中位值/10^-6	17.5	0.095	104	35.5	0.058	49.9	37.4	109
Pt₁GL.(n=198)	含量范围/10^-6	0.1~11.2	0.01~0.17	11.5~108	3.05~52.8	0.012~0.165	1.99~56.2	8.25~94.8	17.1~329
	算术平均值/10^-6	3.10	0.046	48.8	14.4	0.051	18.6	39.3	67.9
	变异系数/%	80.4	56.5	53.8	72.8	42.0	70.5	30.2	37.9
	中位值/10^-6	2.28	0.040	41.2	9.34	0.047	14.6	40.2	65.8
花岗质岩浆岩(n=374)	含量范围/10^-6	0.03~13	0.01~0.771	2~281	2.88~40.8	0.007~0.149	1.01~109	7.5~76.8	20.5~145
	算术平均值/10^-6	3.17	0.041	49.2	12.7	0.045	17.6	35.2	55.7
	变异系数/%	86.9	125.8	56.7	60.5	44.9	72.0	33.8	28.0
	中位值/10^-6	2.20	0.030	47.6	10.65	0.040	15.6	36.0	53.7
云南省土壤背景值^[38]/10^-6		18.4	0.22	65.2	46.3	0.06	42.5	40.6	89.7
宣威市落水镇^[44]/10^-6		13.6	1.62	135.2	233.8	0.09	74.5	32.8	185.7
宣威市热水镇^[45]/10^-6		18.1	1.18	174.1	202.2	0.09	71.1	34.9	167.2
广南县^[46]/10^-6		29.88	4.96	111.49	50.02	0.35	63.58	45.42	224.63
保山市^[47]/10^-6		23	0.269	128	48.7	0.178	57.9	45.2	114.8

Statistical results of average soil heavy metal content in different geological units

Soil environmental grade evaluation

Variation characteristics of heavy metal content in farming soil and natural soil with different parent materials

The element rotation factor loading diagram in Guanshang group (D₁g) soil

The element rotation factor loading diagram in Granitic magmatic soil

Evaluation map of the accumulation index (I_geo) of heavy metals in different soil parent materials

Evaluation map of potential ecological risk index of heavy metals in different soil parent materials

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